Morita's projectivity conjecture for integral models of Shimura varieties

Let (G,X)(G,\mathcal{X}) be the Shimura datum under consideration, let GadG^{\operatorname{ad}} be its adjoint group, let NNN\in\mathbb{N} with N3N\geq 3, and let N(N)\mathcal{N}(N) be the integral model over O(G,X)[1N]O(G,\mathcal{X})[{1\over N}]. Morita's conjecture. If the Q\mathbb{Q}-rank of GadG^{\operatorname{ad}} is 00, then N(N)\mathcal{N}(N) is projective over O(G,X)[1N]O(G,\mathcal{X})[{1\over N}]. This conjecture predicts projectivity of the integral model in the anisotropic adjoint case, paralleling projectivity of the complex Shimura variety. Its resolution status is not specified in the supplied text.

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Primary source

Adrian Vasiu, “Geometry of Shimura varieties of Hodge type over finite fields”, arXiv:0712.1840 (2007).

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